The girl's mother was taken to a local trauma center, where she was pronounced dead. She was identified Wednesday as Emily Stephanie Jimenez, 19, said Los Angeles County Coroner Chief Craig Harvey.

Medical examinations were scheduled for all three victims Wednesday, though the findings could be deferred for toxicology results, Harvey said.

The family lived in Long Beach, he said.

Long Beach Fire Department crews had to cut all three victims from the wreckage of their vehicle, which had rolled over several times and come to rest on the Union Pacific railroad tracks next to the freeway.

It took about 25 minutes for firefighters to cut through the mangled remains of the SUV.

According to the CHP, the woman was driving the 2001 Ford Explorer when she lost control of the vehicle, veered off the freeway and crashed.

Investigators were still working to determine what caused her to lose control of the car, according to the CHP.